1.\" 2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as 9.\" the first lines of this file unmodified other than the possible 10.\" addition of one or more copyright notices. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice(s), this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 16.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY 19.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 25.\" DAMAGE. 26.\" 27.Dd November 21, 2001 28.Dt VFS_GETNEWFSID 9 29.Os 30.Sh NAME 31.Nm vfs_getnewfsid 32.Nd "allocate a new file system identifier" 33.Sh SYNOPSIS 34.In sys/param.h 35.In sys/mount.h 36.Ft void 37.Fn vfs_getnewfsid "struct mount *mp" 38.Sh DESCRIPTION 39The 40.Fn vfs_getnewfsid 41function allocates a new file system identifier for the mount point given. 42File systems typically call 43.Fn vfs_getnewfsid 44in their mount routine in order to acquire a unique ID within the system 45which can later be used to uniquely identify the file system via calls such as 46.Xr vfs_getvfs 9 . 47.Pp 48The actual 49.Vt fsid 50is made up of two 32 bit integers, that are stored in the 51.Vt statfs 52structure of 53.Fa mp . 54The first integer is unique in the set of mounted file systems, 55while the second holds the file system type. 56.Bd -literal 57typedef struct fsid { 58 int32_t val[2]; 59} fsid_t; 60.Ed 61.Sh PSEUDOCODE 62.Bd -literal 63xxx_mount(struct mount *mp, char *path, caddr_t data, 64 struct nameidata *ndp, struct thread *td) 65{ 66 ... 67 vfs_getnewfsid(mp); 68 ... 69} 70.Ed 71.Sh SEE ALSO 72.Xr vfs_getvfs 9 73.Sh AUTHORS 74This manual page was written by 75.An Chad David Aq Mt davidc@acns.ab.ca . 76